https://api.bridgedataoutput.com/api/v2/OData/mlspin/Properties?$filter=not(BedroomsTotal le 3) and (City eq 'Boston')&$select=ListingKey,ListingContractDate,BedroomsTotal,StreetName,OnMarketDate,PropertyType,ModificationTimestamp,ListAgent,BedroomsTotal&$top=10
A boolean ‘Not’ must enclose its operands in a parenthesis with not as an operator i.e. not(City eq ‘Elkwood’).